Head lamp



E. P. BONE HEA-D LAMP Jan 6, 1931.

Filed Jan. 30, 1928 1 N VEN TOR.

A TTORNE Y.

My invention relates to headlamps and more particularly means thereinfor projecting an image from a specific pattern in the initial producingmeans without] requiring I v any assistance from the 1."efiectorior lensexment burns out the other will still operate and I H i 3 provideillumination sufiicient to enable the An ideal light image on the roadahead'of autoist to reach his'destination in safety. an automobile isone in: which the image is V in the general form of an isoscelestriangle tion selected. for illustration,

with abroad base. This-result has been approximated by forming flutes orconvolu-f tions on the reflector or lens of the headlamp however, theresultant imageis not well de- 7 fined and has dark spots or waves.Manufacturing expense also such construction." U I One of the objects ofmy invention is to and) cept in projection.

Patented Jan. 6, 1931 I mm 1''. mm, or cmcmnArnoriro 1 HEA LAMPApplication lileil January 30,19%; -Seria1No'. 0,5 49.

In the particular embodim v U TED PATE T/ OFFICE Y cie'ntelectricalenergy to render the V-filamentincandescent and unnecessaryillumination'and cost'will be avoided, and this is anotherlobject of myinvention. If one filaent of my invenfj Figure 1 is a vertical axialsection through 3 a headlamp usingfiny novel bulb, f Fig. 2 is adiagrammatic view of the headlamp and a wall upon which the light raysare cast forming the desired image. presents a drawback to Fig. 3, adetail, is an enlarged view of the filaments of thebulb'secured to thebulb base,

7 attain such ideal illumination without any Fig. 4-, is awiring diagramof the electrical of the above imperfections or drawbacks acconnections.we 20 companying it. I accomplish-this by providing a novel incandescentlamp for the headlamp which obviates, the necessity of flutes orconvolutions on the lens or reflector. Another object of my inventionis'to pro- 2 vide an area of illumination immediately in front of theheadlamp which is sufiiciently spread out to illuminate both sides ofthe road and another area ofigreater concentration to brightly light theroad at a great distance from the lamp. To accomplish this, I constructthe headlamp bulb with a V-shaped filamentor 'its'equivalent for thedistant illumination and an elongated horizontal filament for nearerillumination, both of which may be formed as one or may be separatelymounted.

Experience has shown that the V-shaped filament which is of greaterconcentration and illuminates the roadway a great distance ahead, isneeded only when the automobile is moving at a fair rateof speed, andthat when the machine is standing still or .is moving very slowly, thespread-out area of illumination provided by the horizontal filament isample :to provide suflicient light. Therefore, I prefer to connect theV-filament to the generator of the automobile and the horizontalfilament to the battery. When the automobile is standing still or whenrunning very slowly the generator will not provide surfi- "Referringnowto the drawings, the headlamp. 1 of any suitable design has a twopart casing 2 'anda plano-convex lens 3 secured to the casing in anydesired manner. A reflector 27 having a flaring rim 31 is placed insidethe rear part of the casing 2 and is securely. held'inposition betweenan annularabutment 7'on the front half of the casing and an abutment 5on the rear half, both struck up Within the casing. 'Atranslucentscreen. v60f mica or other materialis placed upright horizontally andsecured to the inside of "the; casing, slightly below the axis oftheheadlamp. My novel incandescent lamp' passes through a central aperture8 r in the rear reflector and is removably secured in any convenientmanner.

The incandescent lamp consists of any suitablebase 9, through which theconnections t o-the V-filament 10 above and hori-'' zontal elongatedfilament 11 below, pass and are firmly secured. :The filamentsareenclosed within the usualtransparent. casing 12. I A spring connection28' supported by posts 29 and 30 makes contact between the connectionsin the bulb base and the contact post 4 passing out through the. casing.Referring now particularly to Fig; f the-drawings, aconnection 13 to oneend of the V-fila ment' and a connection 14 to one end ofv thehorizontal filament are preferably joined together and pass into acommon ground 15. The connection 16 from the other end of the V-filamentis connected to the generator 17, grounded at 18. The connection 19 fromthe other end of the horizontal filament terminates in the battery 20,grounded at 21. A polarized switch or check valve 22 is provided betweenthe generator and battery and connected to each to prevent draining ofelectricity from the strike the reflector and passing out through thelens appear on the board in the general form of an isosceles triangle 25of lesser illuminating intensity than area 23. The greater portion ofthe rays forming the base or lower part of the generally triangularimage are formed by the horizontal filament 11 and the apex or upperpart by the V filament 10. The two filaments are so placed in relationto each other and situated within the headlamp as to produce with theirprojected rays this ideal image. This desired image is effected from thetwo filaments without change of shape or refraction of rays by thereflector or lens. The shadowed or darker area 26 is formed by thescreen 6 from Within the headlamp, and is intended to be cast at suchposition as to prevent glare inthe eyes of the driver of an opposingvehicle. The area 23 is of such intensity as to provide brilliantillumination a great distance ahead, and the area 25 is provided only ashort distance in front of the lamp but is spread out to illuminate bothsides of the roadway.

It can readily be seen that since the V-filament receives operativeenergy only from the generator, it will not be used except when themotor turns at a speed suflicient to provide the necessary current,while the horizontal filament may burn whether the motor is running ornot since it is connected to the battery.

As here shown, the V-filament is placed at the focal point of thereflector above the horizontal filament but if a parabolic headlamp isused, the horizontal filament should be above rather than below sincethe image cast would be inverted. V

I have shown and described my invention in its preferred form, however,I do not wish to be limited to this form alone as many changes may bemade without departing from the spirit of my invention and I intend cureby Letters Patent of the United States:

1. The combination with a headlamp having a screen, a reflector and aplano-convex lens, of an electric bulb adapted to cast an image ahead ofthe headlamp in the general form of an isosceles triangle with the baseat the bottom, said bulb comprised of a base, a low concentrationfilament perpendicular to the axis of the headlamp to form the lowerbroadportion of the triangular image of lesser light intensity and ahigh concentration filament at the focal point of the reflector to castthe upper portion of the image of greater light intensity.

2. The combination with a headlamp having a screen, a reflector and aplano-convex lens of an electric bulb adapted to cast an image ahead ofthe headlamp in the general form of an isosceles triangle with the baseat the bottom, said bulb comprised of a base, a horizontal elongatedfilament perpendicular to the axis of the headlamp to form the lowerbroad portion of the triangular image of lesser'light intensity and aV-shaped filament in a parallel plane with said horizontal filament tocast the upper portion or apex of the image of greater light intensity.

In testimony whereof I have hereunto set my hand.

EVAN P. BONE.

to include all forms readable on the claims.

I claim as my invention and desire to se-

